Where to Use 74LS08 IC
There are many applications of IC 74LS08. A few mentioned below.
1. The chip is basically used where AND logic operation is needed. There are four AND gates in the chip, we can use one or all gates simultaneously.
2. The chip is used in systems where high speed AND operation is needed. As mentioned earlier the gates in the chip are designed by SCHOTTKY TRANSISTORS to make the switching delays of gates less. Because of this the chip can be used for high speed AND operations.
3. 74LS08 is one of cheapest IC present in market for AND logic operation. It is really popular and is available everywhere.
4. The chip provides TTL outputs which are needed in some systems.
The truth table of AND gate is given as,
Input1
Input2
AND Output
LOW
LOW
LOW
HIGH
LOW
LOW
LOW
HIGH
LOW
HIGH
HIGH
HIGH
74LS08 Pin configuration
74LS08 is a 14 PIN IC. The chip is available in different packages and is chosen depending on requirement. The description for each pin is given below.
Pin Number
Description
AND GATE 1
1
A1-INPUT1 of GATE 1
2
B1-INPUT2 of GATE 1
3
Y1-OUTPUT of GATE1
AND GATE 2
4
A2-INPUT1 of GATE 2
5
B2-INPUT2 of GATE 2
6
Y2-OUTPUT of GATE2
AND GATE 3
9
A3-INPUT1 of GATE 3
10
B3-INPUT2 of GATE 3
8
Y3-OUTPUT of GATE3
AND GATE 4
12
A4-INPUT1 of GATE 4
13
B4-INPUT2 of GATE 4
11
Y4-OUTPUT of GATE4
SHARED TERMINALS
7
GND- Connected to ground
14
VCC-Connected to positive voltage to provide power to all four gates
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